CN109235769B - Large-span concave fish belly type combined reinforced truss structure and installation method thereof - Google Patents

Abstract

The invention relates to a large-span concave fish-bellied composite reinforced truss structure and an installation method thereof. The large-area roof with thick ends and light and thin middle can be formed by a plurality of parallel connection, the structure is complex, and the structure is more stable than the fish belly truss with large middle and small two ends; controlling the concave fish belly shape of the whole truss according to the sizes and the lengths of the triangular trusses at the two ends of the secondary truss and the single chord in the middle; the main trusses are shared among the trusses and the connecting rods are connected in a cross manner, so that the whole roof truss forms a whole with reasonable stress and attractive appearance. The structure of the fish-bellied truss is similar to that of the existing fish-bellied truss, but the modeling is opposite, and on the basis of sharing the main truss, the secondary trusses are connected in a cross manner through upper and lower chord connecting rods, so that the main trusses and the secondary trusses form a complete whole.

Description

Large-span concave fish belly type combined reinforced truss structure and installation method thereof

Technical Field

The invention relates to the technical field of large roof trusses, in particular to a large-span concave fish-bellied composite reinforced truss structure and an installation method thereof.

Background

With the continuous development of domestic economy, overpasses, corridors and large-scale exhibition halls are continuously emerging, and large-span roof truss layers with different shapes are endless; the choice of the structural form and the structural design directly determine the cost, rigidity and stability of the building structure, and also relate to the safety and comfort of pedestrians borne by the building structure. The former fish-bellied truss has single modeling, heavy truss middle part, and large steel consumption when forming a large-span roof truss, and is uneconomical.

Disclosure of Invention

In order to solve the technical problems, the invention provides a large-span concave fish-web type combined reinforced truss structure and an installation method thereof, the structure of the structure is similar to that of the existing fish-web type truss structure, but the structure is opposite, and on the basis of sharing a main truss, secondary trusses are connected in a cross manner through upper and lower chords and tie bars, so that the main trusses and the secondary trusses form a complete whole.

In order to achieve the technical purpose, the invention adopts the following technical scheme:

a large-span concave fish belly formula combination reinforced truss structure which characterized in that:

the truss comprises positioning lattice columns, an arch-shaped main truss, a modeling main truss, a reinforced modeling secondary truss, a light modeling secondary truss, a cantilever main truss and truss connecting rods arranged between the trusses;

the four positioning lattice columns are vertically arranged and are arranged in a rectangular shape;

the two arched main trusses are respectively and longitudinally arranged between the two positioning lattice columns, and the two ends of the arched main trusses are respectively welded and fixed with the positioning lattice columns;

the two modeling main trusses are transversely arranged between the two positioning lattice columns respectively, and the two end parts of the modeling main trusses are welded and fixed with the positioning lattice columns respectively;

the positioning lattice column, the arch-shaped main truss and the modeling main truss are enclosed to form a rectangular framework;

the four cantilever main trusses are respectively arranged at the outer sides of the positioning lattice columns corresponding to the end parts of the arched main trusses and coaxially arranged with the arched main trusses, and the inner side end parts of the cantilever main trusses are fixedly welded with the positioning lattice columns;

the reinforced modeling secondary trusses are transversely and uniformly arranged between the two modeling main trusses, and the end parts of the reinforced modeling secondary trusses are welded and fixed with the arched main trusses respectively;

the light modeling secondary trusses are arranged between the two overhanging main trusses at the two ends of the secondary truss sheet area formed by the reinforced modeling secondary trusses, are arranged in parallel with the reinforced modeling secondary trusses, and are welded and fixed with the overhanging main trusses at the ends respectively;

the truss connecting rod comprises an upper chord and lower chord connecting horizontal rod and an upper chord and lower chord connecting reinforcing diagonal rod which are used for connecting and reinforcing the reinforced modeling secondary truss, a main chord longitudinal connecting rod which is arranged in the center of the whole truss and used for connecting all the reinforced modeling secondary trusss and the light modeling secondary trusss into a whole, and a long sealing rod, a long conversion reinforcing rod and a cantilever reinforcing diagonal rod which are used for reinforcing the cantilever main truss at the end part.

As the preferable technical scheme of the invention, the upper chord and lower chord connecting horizontal rods are horizontally arranged between two upper chords or two lower chords of two adjacent reinforced molding secondary trusses, and the upper chord and lower chord connecting reinforcing diagonal rods are arranged between one upper chord and one lower chord of the two adjacent reinforced molding secondary trusses; the two ends of the longitudinal connecting rod of the main chord member are continuous parts penetrating through all the secondary trusses with light modeling, the middle is a discontinuous part, the longitudinal connecting rod consists of a plurality of split rods, and the split rods are arranged between two adjacent secondary trusses with reinforced modeling; the end through length sealing rod and the through length conversion reinforcing rod are arranged at the tail end of the cantilever main truss in parallel and are arranged in a transverse through length mode, and the two cantilever main trusses are connected into a whole and connected with a transverse adjacent combined truss structure; the cantilever reinforcing diagonal rods are arranged between the through length conversion reinforcing rods and the positioning lattice columns, and the middle of the cantilever reinforcing diagonal rods are fixedly connected with the passing light modeling secondary trusses.

Further, the positioning lattice column is formed by combining five steel pipes, is rectangular in whole and comprises a main upright column positioned in the middle and corner upright columns positioned at four corners; horizontal cross bars are respectively arranged between the main upright post and the corner upright post and between the adjacent corner upright posts at the top and bottom positions of the positioning lattice column; a horizontal patching rod is arranged between the main upright post and the corner upright post at the middle position of the positioning lattice column; and oblique patching rods are respectively arranged between the middle position of the main upright post and the top and bottom of the corner upright post for further reinforcement.

Further, the arch main truss is a double-row frame and comprises two upper chord straight rods and two arch lower chords which are arranged in parallel, a first straight web member and a first inclined web member are arranged between the upper chord straight rods and the arch lower chords on the same side, an upper chord horizontal connecting rod is arranged between the two upper chord straight rods, and a lower chord horizontal connecting rod is arranged between the two arch lower chords; the upper chord straight rod and the arched lower chord are formed by splicing a plurality of sections of short rods.

Furthermore, the modeling main truss is a double-row frame and comprises two upper chord combined rods which are arranged in parallel, the middle of each upper chord combined rod is low and two sides of each upper chord combined rod are high, the two upper chord combined rods are fixed through a horizontal connecting rod in a tie manner, and a horizontal reinforcing rod is arranged in the middle of each upper chord combined rod for reinforcing; four lower chords are arranged at the bottom of the upper chord combined rod, and a K-shaped frame is formed by the four lower chords and the two upper chord combined rods respectively; a second straight web member and a second inclined web member are arranged between the upper chord combined rod and the lower chord on the same side; the two lower chords arranged in parallel are fixed by a horizontal tie bar tie; and an inclined reinforcing rod is also arranged, one end of the inclined reinforcing rod is fixed on the upper chord combined rod, and the other end of the inclined reinforcing rod is fixed in the middle position of the horizontal connecting rod between the lower chords.

Furthermore, the cantilever main truss is a double-row frame and comprises two cantilever upper chords and two cantilever lower chords which are arranged in parallel, one ends of the two cantilever upper chords and the two cantilever lower chords are correspondingly fixed to form a tripod, and cantilever conversion supports are arranged at fixed positions; an overhanging straight web member and an overhanging inclined web member are arranged between the overhanging upper chords and the overhanging lower chords on the same side, an upper chord connecting tie rod is arranged between the two overhanging upper chords, and a lower chord connecting tie rod is arranged between the two overhanging lower chords; the overhanging upper chord member extends to one side of the overhanging conversion support to form an overhanging extension chord member.

Furthermore, the end through long sealing rod is transversely and vertically arranged at the tail end of the overhanging extension chord member, and the through long conversion reinforcing rod is transversely arranged at the overhanging conversion support position.

Further, the light modeling secondary truss is a K-shaped single-piece truss and comprises an upper chord member and a first combined lower chord member, wherein the middle of the upper chord member is broken into two sections for the longitudinal connecting rod of the main chord member to pass through and be fixedly connected with the upper chord member; and a third straight web member and a third diagonal web member are arranged between the upper chord member and the first combined lower chord member.

Further, the reinforced secondary truss is a K-shaped single-piece truss and comprises box-shaped upper chords and second combined lower chords, and two ends of a split rod of the main chord longitudinally connected with a tie rod are welded at the middle positions of two adjacent box-shaped upper chords; and a fourth straight web member and a fourth inclined web member are arranged between the box-shaped upper chord member and the second combined lower chord member.

In addition, the invention also discloses a method for installing the large-span concave fish belly type combined reinforced truss structure, which is characterized by comprising the following steps of:

step one, preparing: preparing materials and measuring and positioning;

step two, installing a positioning lattice column: firstly, positioning an upper tire of a main upright post, sequentially assembling a horizontal patching rod and an oblique patching rod from bottom to top, welding the horizontal patching rod and the oblique patching rod with the main upright post, and sequentially symmetrically installing angle upright posts and sequentially symmetrically welding the horizontal patching rod and the oblique patching rod with the angle upright posts; finally, installing a horizontal cross rod and welding the horizontal cross rod with the corner upright post;

step three, installing a modeling main truss and welding with the positioning lattice column: firstly, assembling an upper chord combined rod, positioning an upper tire, assembling a second straight web member and a lower chord member in sequence, welding, assembling a second inclined web member, welding an upper chord combined rod and the lower chord member, assembling a horizontal reinforcing rod, horizontally connecting a tie rod in sequence, welding, assembling an inclined reinforcing rod, and welding;

step four, installing an arch-shaped main truss and welding with the positioning lattice column: firstly, positioning an upper tire of an arched lower chord member, sequentially positioning the upper tire of a first straight web member, then positioning the upper tire of the upper chord member, sequentially welding the interfaces of the first straight web member, the arched lower chord member and the upper chord member from the middle to the two ends, assembling a first inclined web member, welding the first inclined web member, the arched lower chord member and the upper chord member, assembling an upper chord connecting rod, and welding the upper chord connecting rod and the lower chord connecting rod;

step five, simultaneously installing split rods of middle discontinuous parts of the reinforced molding secondary truss and the main chord longitudinal connecting rods: firstly, positioning an upper tire of a box-type upper chord member, welding and fixing two ends of the upper tire with an arch-shaped main truss respectively, then assembling and fixing an upper tire of a fourth straight web member, assembling an upper tire of a second combined lower chord member, welding the upper chord member of the box-type upper chord member, the upper tire of the second combined lower chord member and the upper tire of the fourth straight web member respectively, assembling and welding a fourth inclined web member, and welding two ends of a split member respectively at the middle positions of two adjacent box-type upper chord members;

step six, installing a cantilever main truss: firstly, splicing and positioning an upper tire by an overhanging upper chord member, splicing and welding an overhanging straight web member and an overhanging lower chord member in sequence, splicing and welding an overhanging inclined web member, and simultaneously welding the overhanging upper chord member and the overhanging lower chord member; finally, sequentially splicing and welding a lower chord connecting rod and an upper chord connecting rod, sequentially splicing and assembling a cantilever conversion support, a cantilever extension chord, simultaneously installing a through length sealing rod at the end part and a through length conversion reinforcing rod, and welding;

step seven, installing continuous parts at two ends of the longitudinal connecting rods of the light modeling secondary truss and the main chord member: the main chord member is longitudinally connected with the tie bars and the light modeling secondary truss, and the light modeling secondary truss and the overhanging main truss are respectively welded; firstly, positioning an upper chord member upper tire and welding and fixing the upper chord member upper tire with a main chord member longitudinal connecting rod, then assembling and fixing a third straight web member upper tire, assembling a first combined lower chord member upper tire, welding an upper chord member, the first combined lower chord member and the third straight web member respectively, and finally assembling and welding a third inclined web member;

step eight, installing residual truss connecting rods: the method comprises the steps of installing upper and lower chord connection horizontal rods between reinforced modeling secondary trusses, and installing overhanging reinforced diagonal rods between overhanging main trusses and positioning lattice columns;

and step nine, overall quality inspection, namely finishing the large-span concave fish belly type combined reinforced truss structure.

The truss structure is a special-shaped large-span truss, and a plurality of trusses can be connected in parallel to form a large-area roof with thick ends and light and thin middle, and the structure is complex and more stable than a fish-bellied truss with large middle and small ends; meanwhile, the concave fish belly shape of the whole truss is controlled according to the sizes and the lengths of the triangular trusses at the two ends of the secondary truss and the single chord in the middle; the main trusses are shared among the trusses and the connecting rods are connected in a cross manner, so that the whole roof truss forms a whole with reasonable stress and attractive appearance;

specifically, compared with the prior art, the invention ensures the stress state of the truss while ensuring the modeling through the following four main technologies:

1) The positioning lattice column is Guan Li column type, the middle main upright pole is connected with the four corner secondary upright poles and the secondary upright poles through the round tube horizontal pole and the patching pole to form a lattice column, so that the rigidity of the truss is ensured;

2) The lower chord is an arch-shaped main truss, and the lower chord is arch-shaped, so that the stress capability of the main truss is enhanced;

3) The secondary trusses are single-piece trusses, single chords are connected with the single-piece near-triangular trusses at the two ends, and each truss is used for controlling the modeling of the whole truss according to the sizes of the triangular trusses at the two ends of the secondary trusses and the single chords in the middle;

4) The main truss and the secondary truss are reasonably distributed to form an integral truss, and the strength is ensured.

Drawings

The foregoing and/or other aspects and advantages of the present invention will become more apparent and more readily appreciated from the detailed description taken in conjunction with the following drawings, which are meant to be illustrative only and not limiting of the invention, wherein:

FIG. 1 is a schematic diagram of the overall structure of a large-span concave fish belly type composite girder structure according to the present invention;

FIG. 2 is a schematic view of the structure of an arched main truss according to the present invention;

FIG. 3 is a schematic view of a spacer grid column according to the present invention;

FIG. 4 is a schematic structural view of a modeling main truss according to the present invention;

FIG. 5 is a schematic view of the structure of the overhanging main truss according to the invention;

FIG. 6 is a schematic view of the structure of a reinforced modeling secondary truss according to the present invention;

fig. 7 is a schematic view of the structure of a lightweight shaped secondary truss according to the present invention.

Reference numerals: 1-truss connecting rod, 12-main chord longitudinal connecting rod, 13-end through long sealing rod, 14-through long conversion reinforcing rod, 15-overhanging reinforcing diagonal, 16-upper and lower chord connection reinforcing diagonal, 2-light modeling secondary truss, 21-upper chord, 22-first combined lower chord, 23-third straight web member, 24-third diagonal web member, 3-positioning lattice column, 31-main column, 32-angle column, 33-horizontal cross rod, 34-horizontal affix rod, 35-oblique affix rod, 4-arched main truss, 41-arched lower chord member, 42-upper chord straight rod, 43-first straight web member, 44-upper chord horizontal connecting rod, 45-lower chord horizontal connecting rod 46-first diagonal web members, 5-modeling main trusses, 51-upper chord combined members, 52-lower chord members, 53-horizontal reinforcing members, 54-horizontal connecting tie bars, 55-second straight web members, 56-diagonal reinforcing members, 57-second diagonal web members, 6-overhanging main trusses, 61-overhanging upper chord members, 62-overhanging lower chord members, 63-lower chord connected tie bars, 64-upper chord connected tie bars, 65-overhanging straight web members, 66-overhanging diagonal web members, 67-overhanging conversion brackets, 68-overhanging extension chord members, 7-reinforcing modeling secondary trusses, 71-box-type upper chord members, 72-second combined lower chord members, 73-fourth straight web members and 74-fourth diagonal web members.

Detailed Description

Hereinafter, an embodiment of a large-span concave fish-web type composite reinforced truss structure and a method of installing the same according to the present invention will be described with reference to the accompanying drawings.

The examples described herein are specific embodiments of the present invention, which are intended to illustrate the inventive concept, are intended to be illustrative and exemplary, and should not be construed as limiting the invention to the embodiments and scope of the invention. In addition to the embodiments described herein, those skilled in the art can adopt other obvious solutions based on the disclosure of the claims and specification of the present application, including those adopting any obvious substitutions and modifications to the embodiments described herein. The drawings in the present specification are schematic views, which assist in explaining the concept of the present invention, and schematically show the shapes of the respective parts and their interrelationships. Note that, in order to clearly show the structures of the components of the embodiments of the present invention, the drawings are not drawn to the same scale. Like reference numerals are used to denote like parts.

The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention. Referring to fig. 1, a large-span concave fish belly type combined reinforced truss structure is characterized in that: the truss comprises positioning lattice columns 3, an arch-shaped main truss 4, a modeling main truss 5, a reinforced modeling secondary truss 7, a light modeling secondary truss 2, a cantilever main truss 6 and truss connecting rods 1 arranged between the trusses; the four positioning lattice columns 3 are vertically arranged and are arranged in a rectangular shape; the two arched main trusses 4 are respectively and longitudinally arranged between the two positioning lattice columns 3, and the two ends of each arched main truss are respectively welded and fixed with the positioning lattice columns 3; the number of the modeling main trusses 5 is two, the modeling main trusses are respectively and transversely arranged between the two positioning lattice columns 3, and the two end parts are respectively welded and fixed with the positioning lattice columns 3; the positioning lattice column 3, the arch-shaped main truss 4 and the modeling main truss 5 are enclosed to form a rectangular framework; the four overhanging main trusses 6 are respectively arranged at the outer sides of the positioning lattice columns 3 corresponding to the end parts of the arched main trusses 4 and are coaxially arranged with the arched main trusses 4, and the inner side end parts of the overhanging main trusses are fixedly welded with the positioning lattice columns 3; the reinforced modeling secondary trusses 7 are transversely and uniformly arranged between the two modeling main trusses 5, and the end parts of the reinforced modeling secondary trusses are respectively welded and fixed with the arched main trusses 4; the light modeling secondary trusses 2 are arranged between two overhanging main trusses 6 at two ends of a secondary truss sheet area formed by the reinforced modeling secondary trusses 7, are arranged in parallel with the reinforced modeling secondary trusses 7, and are welded and fixed with the overhanging main trusses 6 at the end parts respectively; the truss connecting rod 1 comprises an upper chord connection horizontal rod, a lower chord connection reinforcing diagonal rod 16 and a main chord longitudinal connecting rod 12, wherein the upper chord connection horizontal rod and the lower chord connection reinforcing diagonal rod are used for connecting and reinforcing the reinforced modeling sub-truss 7, the main chord longitudinal connecting rod 12 is arranged in the center of the whole truss and is used for connecting all the reinforced modeling sub-truss 7 and the light modeling sub-truss 2 into a whole, and the end part of the overhanging main truss 6 is provided with a through long sealing rod 13, a through long conversion reinforcing rod 14 and an overhanging reinforcing diagonal rod 15.

The upper and lower chord connection horizontal rods are horizontally arranged between two upper chords or two lower chords of the adjacent two reinforced molding secondary trusses 7, and the upper and lower chord connection reinforced diagonal rods 16 are arranged between one upper chord and one lower chord of the adjacent two reinforced molding secondary trusses 7; the two ends of the longitudinal connecting rod 12 of the main chord member are continuous parts penetrating all the light modeling secondary trusses 2, the middle is a discontinuous part, the longitudinal connecting rod consists of a plurality of split rods, and the split rods are arranged between two adjacent reinforcing modeling secondary trusses 7; the end through length sealing rod 13 and the through length conversion reinforcing rod 14 are arranged at the tail end of the cantilever main truss 6 in parallel and are arranged in a transverse through length mode, and the two cantilever main trusses 6 are connected into a whole and connected with a transverse adjacent combined truss structure; the cantilever reinforcing diagonal 15 is arranged between the through length conversion reinforcing rod 14 and the positioning lattice column 3, and the middle of the cantilever reinforcing diagonal is fixedly connected with the passing light modeling secondary truss 2.

As shown in fig. 2, the arch main truss 4 is a double-row frame, and comprises two upper chord straight rods 42 and two arch lower chords 41 which are arranged in parallel, a first straight web member 43 and a first diagonal web member 46 are arranged between the upper chord straight rods 42 and the arch lower chords 41 on the same side, an upper chord horizontal connecting rod 44 is arranged between the two upper chord straight rods 42, and a lower chord horizontal connecting rod 45 is arranged between the two arch lower chords 41. The upper chord straight rod 42 and the arched lower chord 41 are formed by splicing a plurality of short rods.

As shown in fig. 3, the positioning lattice column 3 is formed by combining five steel pipes, is rectangular in whole and comprises a main upright column 31 positioned in the middle and corner upright columns 32 positioned at four corners; horizontal cross bars 33 are respectively arranged between the main upright posts 31 and the corner upright posts 32 and between the adjacent corner upright posts 32 at the top and bottom positions of the positioning lattice posts 3; a horizontal patching rod 34 is arranged between the main upright 31 and the corner upright 32 at the middle position of the positioning lattice column 3; an oblique fixing rod 35 is further arranged between the middle position of the main upright 31 and the top and bottom of the corner upright 32 for further reinforcement.

As shown in fig. 4, the modeling main truss 5 is a double-row frame and comprises two upper chord combined rods 51 which are arranged in parallel, wherein the middle of each upper chord combined rod 51 is low and high, the two upper chord combined rods 51 are fixedly tied through a horizontal connecting rod 54, and a horizontal reinforcing rod 53 is arranged in the middle for reinforcing; four lower chords 52 are arranged at the bottom of the upper chord combined rod 51 and respectively form a K-shaped frame with the two upper chord combined rods 51; a second straight web member 55 and a second diagonal web member 57 are arranged between the same-side upper chord composite member 51 and the lower chord member 52; the two lower chords 52 arranged in parallel are fixedly tied through a horizontal tie rod 54; an inclined reinforcing rod 56 is further provided, one end of which is fixed to the upper chord member 51, and the other end of which is fixed to an intermediate position of the horizontal tie rod 54 between the lower chords 52.

As shown in fig. 5, the overhanging main truss 6 is a double-row frame, and comprises two overhanging upper chords 61 and two overhanging lower chords 62 which are arranged in parallel, one ends of the two overhanging upper chords and the two overhanging lower chords are correspondingly fixed to form a tripod, and overhanging conversion brackets 67 are arranged at fixed positions; an overhanging straight web member 65 and an overhanging inclined web member 66 are arranged between the overhanging upper chord member 61 and the overhanging lower chord member 62 on the same side, an upper chord connecting rod 64 is arranged between the two overhanging upper chord members 61, and a lower chord connecting rod 63 is arranged between the two overhanging lower chord members 62; the overhanging upper chord member 61 extends to one side of the overhanging conversion bracket 67 to form an overhanging extension chord member 68. The end through length sealing rod 13 is transversely and vertically arranged at the tail end of the cantilever extension chord 68, and the through length conversion reinforcing rod 14 is transversely arranged at the cantilever conversion support 67.

As shown in fig. 6, the reinforced secondary truss 7 is a K-shaped monolithic truss, and comprises a box-shaped upper chord 71 and a second combined lower chord 72, wherein two ends of a split rod of the main chord longitudinal tie rod 12 are welded at the middle position of two adjacent box-shaped upper chords 71; a fourth straight web member 73 and a fourth diagonal web member 74 are provided between the box top chord 71 and the second combined bottom chord 72.

Referring to fig. 7, the light-weight secondary truss 2 is a K-shaped single-piece truss, and comprises an upper chord 21 and a first combined lower chord 22, wherein the middle of the upper chord 21 is broken into two sections for the longitudinal tie bars 12 of the main chord to pass through and be fixedly connected with; a third straight web member 23 and a third diagonal web member 24 are provided between the upper chord 21 and the first combined lower chord 22.

The installation method of the large-span concave fish belly type combined reinforced truss structure comprises the following steps of:

step one, preparing: preparing materials and measuring and positioning;

step two, installing a positioning lattice column 3:

(1) Positioning the upper tire of the main upright column 31;

(2) The horizontal attaching rod 34 and the inclined attaching rod 35 are assembled in sequence from bottom to top and welded with the main upright 31;

(3) The corner upright posts 32 are symmetrically arranged in sequence and are symmetrically welded with the horizontal patching rods 34 and the oblique patching rods 35 in sequence;

(4) Mounting a horizontal cross bar 33 and welding with the corner posts 32;

step three, installing a modeling main truss 5 and welding with the positioning lattice column 3:

(1) The upper chord combined rod 51 is assembled with an upper tire and positioned;

(2) Sequentially assembling and welding the second straight web member 55 and the lower chord member 52;

(3) Assembling and welding the second diagonal web member 57, and simultaneously welding the upper chord composite member 51 and the lower chord member 52;

(4) Assembling and welding a horizontal reinforcing rod 53 and a horizontal connecting rod 54 in sequence;

(5) Assembling and welding the oblique reinforcing rods 56;

step four, installing an arch-shaped main truss 4 and welding with the positioning lattice column 3:

(1) Positioning an upper tire of the arched lower chord 41;

(2) The first straight web members 43 are positioned on the tire in sequence;

(3) The upper chord straight rod 42 is positioned with the upper tire and is welded with the first web member 43 and the arched lower chord member 41 from the middle to the two ends in sequence and is connected with the upper chord straight rod 42;

(4) Assembling the first diagonal web member 46 and welding with the arched lower chord 41 and the upper chord straight rod 42;

(5) Assembling and welding an upper chord horizontal connecting rod 44 and a lower chord horizontal connecting rod 45;

step five, simultaneously installing a split rod of the middle discontinuous part of the reinforced molding secondary truss 7 and the main chord longitudinal connecting rod 12:

(1) Firstly, positioning an upper tire of a box-type upper chord 71, and respectively welding and fixing two ends of the upper tire with an arch main truss 4;

(2) The upper tire of the fourth straight web member 73 is assembled and fixed, and the upper tire of the second combined lower chord member 72 is assembled, wherein the box-shaped upper chord member 71, the second combined lower chord member 72 and the fourth straight web member 73 are respectively welded;

(3) Finally, the fourth diagonal web member 74 is assembled and welded, and two ends of the split member are respectively welded at the middle positions of the two adjacent box-shaped upper chords 71;

step six, installing a cantilever main truss 6:

(1) Splicing and positioning the upper tire by the overhanging upper chord member 61;

(2) Assembling and welding the overhanging straight web member 65 and the overhanging lower chord member 62;

(3) Assembling and welding the overhanging diagonal web member 66, and simultaneously welding the overhanging upper chord member 61 and the overhanging lower chord member 62;

(4) Sequentially splicing and welding a lower chord connecting rod 63 and an upper chord connecting rod 64;

(5) The splicing cantilever conversion support 67 and the cantilever extension chord 68 are assembled, and the mounting end part through the long sealing rod 13 and the through long conversion reinforcing rod 14 are simultaneously mounted and welded;

step seven, installing the light modeling secondary truss 2 and the continuous parts at the two ends of the longitudinal connecting rod 12 of the main chord:

(1) The main chord longitudinal connecting rod 12 is respectively welded with the light modeling secondary truss 2 and the overhanging main truss 6;

(2) Firstly, positioning an upper tire of an upper chord 21 and welding and fixing the upper tire with a main chord longitudinal connecting rod 12;

(3) The upper tire of the third straight web member 23 is assembled and fixed;

(4) The upper tire of the first combined lower chord member 22 is assembled, wherein the upper chord member 21, the first combined lower chord member 22 and the third straight web member 23 are respectively welded;

(5) The third diagonal web member 24 is assembled and welded;

step eight, installing a residual truss connecting rod 1: the method comprises the steps of installing upper and lower chord connection horizontal rods between reinforced modeling secondary trusses 7, and installing overhanging reinforced diagonal rods 15 between overhanging main trusses 6 and positioning lattice columns 3;

and step nine, overall quality inspection, namely a large-span concave fish belly type combined reinforced truss structure.

The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims (8)

1. A large-span concave fish belly formula combination reinforced truss structure which characterized in that:

the truss comprises positioning lattice columns (3), an arch-shaped main truss (4), a modeling main truss (5), a reinforced modeling secondary truss (7), a light modeling secondary truss (2), a cantilever main truss (6) and truss connecting rods (1) arranged between the trusses;

four positioning lattice columns (3) are vertically arranged and are arranged in a rectangular shape;

the two arched main trusses (4) are longitudinally arranged between the two positioning lattice columns (3) respectively, and the two end parts of the arched main trusses are welded and fixed with the positioning lattice columns (3) respectively;

the number of the modeling main trusses (5) is two, the modeling main trusses are respectively and transversely arranged between the two positioning lattice columns (3), and the two end parts are respectively welded and fixed with the positioning lattice columns (3);

the positioning lattice column (3), the arch-shaped main truss (4) and the modeling main truss (5) are enclosed to form a rectangular framework;

the four cantilever main trusses (6) are respectively arranged at the outer sides of the positioning lattice columns (3) corresponding to the end parts of the arched main trusses (4), are coaxially arranged with the arched main trusses (4), and are welded and fixed with the positioning lattice columns (3) at the inner side end parts;

the reinforced modeling secondary trusses (7) are transversely and uniformly arranged between the two modeling main trusses (5), and the end parts of the reinforced modeling secondary trusses are respectively welded and fixed with the arched main trusses (4); the reinforced molding secondary truss (7) is a K-shaped single-piece truss and comprises a box-shaped upper chord member (71) and a second combined lower chord member (72), and a fourth straight web member (73) and a fourth inclined web member (74) are arranged between the box-shaped upper chord member (71) and the second combined lower chord member (72);

the light modeling secondary trusses (2) are arranged between two overhanging main trusses (6) at two ends of a secondary truss sheet area formed by the reinforced modeling secondary trusses (7), are arranged in parallel with the reinforced modeling secondary trusses (7), and are welded and fixed with the overhanging main trusses (6) at the end parts respectively; the light modeling secondary truss (2) is a K-shaped single-piece truss and comprises an upper chord member (21) and a first combined lower chord member (22), wherein the middle of the upper chord member (21) is broken into two sections for the longitudinal connecting rod (12) of the main chord member to pass through and be fixedly connected with the upper chord member; a third straight web member (23) and a third inclined web member (24) are arranged between the upper chord member (21) and the first combined lower chord member (22);

the truss connecting rod (1) comprises an upper chord connecting horizontal rod, a lower chord connecting horizontal rod, an upper chord connecting reinforcing diagonal rod and a lower chord connecting reinforcing diagonal rod, a main chord longitudinal connecting rod (12) and an end part through length sealing rod (13), a through length conversion reinforcing rod (14) and an overhanging reinforcing diagonal rod (15), wherein the upper chord connecting horizontal rod and the lower chord connecting horizontal rod and the upper chord connecting reinforcing diagonal rod are used for connecting and reinforcing the reinforced modeling secondary truss (7), the main chord longitudinal connecting rod (12) is arranged in the center of the whole truss and is used for connecting all the reinforced modeling secondary truss (7) and the light modeling secondary truss (2) into a whole;

two ends of the main chord longitudinal connecting rod (12) are continuous parts penetrating through all the light modeling secondary trusses (2), the middle is a discontinuous part and consists of a plurality of split rods, and the split rods are arranged between two adjacent reinforcing modeling secondary trusses (7); the two ends of the split rod of the main chord longitudinal connecting rod (12) are welded at the middle positions of two adjacent box-shaped upper chords (71).

2. A large span concave fish belly type composite girder construction according to claim 1, wherein: the upper chord and lower chord connecting horizontal rods are horizontally arranged between two upper chords or two lower chords of two adjacent reinforced molding secondary trusses (7), and the upper chord and lower chord connecting reinforcing diagonal rods (16) are arranged between one upper chord and one lower chord of the two adjacent reinforced molding secondary trusses (7); the end through length sealing rod (13) and the through length conversion reinforcing rod (14) are arranged at the tail end of the overhanging main truss (6) in parallel and are arranged in a transverse through length mode, and the two overhanging main trusses (6) are connected into a whole and connected with a transverse adjacent combined truss structure; the cantilever reinforcing diagonal rods (15) are arranged between the through length conversion reinforcing rods (14) and the positioning lattice columns (3), and the middle of the cantilever reinforcing diagonal rods is fixedly connected with the passing light modeling secondary truss (2).

3. A large span concave fish bellied composite reinforced truss structure as defined in claim 2, wherein: the positioning lattice column (3) is formed by combining five steel pipes, is rectangular in whole and comprises a main upright column (31) positioned in the middle and corner upright columns (32) positioned at four corners; horizontal cross bars (33) are respectively arranged between the main upright posts (31) and the corner upright posts (32) and between adjacent corner upright posts (32) at the top and bottom positions of the positioning lattice posts (3); a horizontal decorating rod (34) is arranged between the main upright post (31) and the corner upright post (32) at the middle position of the positioning lattice post (3); and oblique decoration rods (35) are respectively arranged between the middle position of the main upright post (31) and the top and the bottom of the corner upright post (32) for further reinforcement.

4. A large span concave fish belly type composite girder construction according to claim 3, wherein: the arch-shaped main truss (4) is a double-row frame and comprises two upper chord straight rods (42) and two arch-shaped lower chords (41) which are arranged in parallel, a first straight web member (43) and a first diagonal web member (46) are arranged between the upper chord straight rods (42) and the arch-shaped lower chords (41) on the same side, an upper chord horizontal connecting rod (44) is arranged between the two upper chord straight rods (42), and a lower chord horizontal connecting rod (45) is arranged between the two arch-shaped lower chords (41); the upper chord straight rod (42) and the arched lower chord (41) are formed by splicing a plurality of sections of short rods.

5. The large span concave fish belly type composite girder construction as claimed in claim 4, wherein: the modeling main truss (5) is a double-row frame and comprises two upper chord combined rods (51) which are arranged in parallel, the middle of each upper chord combined rod (51) is low, the two upper chord combined rods (51) are high on two sides, the two upper chord combined rods (51) are fixedly tied through a horizontal connecting rod (54), and a horizontal reinforcing rod (53) is arranged in the middle for reinforcing; four lower chords (52) are arranged at the bottom of the upper chord combined rod (51), and a K-shaped frame is formed by the four lower chords and the two upper chord combined rods (51); a second straight web member (55) and a second inclined web member (57) are arranged between the upper chord combined rod (51) and the lower chord (52) on the same side; the two lower chords (52) arranged in parallel are fixed by a horizontal tie rod (54) in a tie manner; an inclined reinforcing rod (56) is also arranged, one end of the inclined reinforcing rod is fixed on the upper chord combined rod (51), and the other end of the inclined reinforcing rod is fixed at the middle position of a horizontal connecting rod (54) between the lower chords (52).

6. The large span concave fish belly type composite girder construction as claimed in claim 5, wherein: the cantilever main truss (6) is a double-row frame and comprises two cantilever upper chords (61) and two cantilever lower chords (62) which are arranged in parallel, one ends of the two cantilever upper chords and the two cantilever lower chords are correspondingly fixed to form a tripod, and cantilever conversion supports (67) are arranged at fixed positions; an overhanging straight web member (65) and an overhanging inclined web member (66) are arranged between the overhanging upper chord member (61) and the overhanging lower chord member (62) on the same side, an upper chord connecting rod (64) is arranged between the two overhanging upper chord members (61), and a lower chord connecting rod (63) is arranged between the two overhanging lower chord members (62); the overhanging upper chord member (61) extends to one side of the overhanging conversion support (67) to form an overhanging extension chord member (68).

7. The large span concave fish belly type composite girder construction as claimed in claim 6, wherein: the end through length sealing rod (13) is transversely and vertically arranged at the tail end of the overhanging extension chord member (68), and the through length conversion reinforcing rod (14) is transversely arranged at the overhanging conversion support (67).

8. A method of installing a large span concave fish bellied composite reinforced truss structure as defined in claim 7 comprising the steps of:

step one, preparing: preparing materials and measuring and positioning;

step two, installing a positioning lattice column (3): firstly, positioning an upper tire of a main upright post (31), sequentially assembling a horizontal decoration rod (34) and an oblique decoration rod (35) from bottom to top, welding the horizontal decoration rod and the oblique decoration rod with the main upright post (31), and sequentially symmetrically installing an angle upright post (32) and sequentially symmetrically welding the horizontal decoration rod (34) and the oblique decoration rod (35); finally, a horizontal cross rod (33) is installed and welded with the corner upright post (32);

step three, installing a modeling main truss (5) and welding with the positioning lattice column (3): firstly, splicing an upper chord combined rod (51) into an upper tire and positioning, splicing a second straight web member (55) and a lower chord member (52) in sequence and welding, splicing a second inclined web member (57) and welding, simultaneously welding the upper chord combined rod (51) and the lower chord member (52), splicing a horizontal reinforcing rod (53) and a horizontal connecting rod (54) in sequence and welding, splicing an inclined reinforcing rod (56) and welding;

step four, installing an arch-shaped main truss (4) and welding with the positioning lattice column (3): firstly, positioning an upper tire of an arched lower chord member (41), sequentially positioning an upper tire of a first straight web member (43), then positioning an upper tire of an upper chord straight rod (42), sequentially welding interfaces of the first straight web member (43) with the arched lower chord member (41) and the upper chord straight rod (42) from the middle to the two ends, assembling a first inclined web member (46), welding the first inclined web member with the arched lower chord member (41) and the upper chord straight rod (42), and assembling and welding an upper chord horizontal connecting rod (44) and a lower chord horizontal connecting rod (45);

step five, simultaneously installing a reinforcing molding secondary truss (7) and a split rod of the middle discontinuous part of a main chord longitudinal connecting rod (12): firstly, positioning an upper tire of a box-shaped upper chord member (71), welding and fixing two ends of the upper tire with an arch-shaped main truss (4) respectively, then splicing and fixing an upper tire of a fourth straight web member (73), splicing an upper tire of a second combined lower chord member (72), wherein the box-shaped upper chord member (71), the second combined lower chord member (72) and the fourth straight web member (73) are respectively welded, splicing and welding a fourth inclined web member (74), and respectively welding two ends of a split member at the middle positions of two adjacent box-shaped upper chord members (71);

step six, installing a cantilever main truss (6): firstly, splicing and positioning an upper tire by an overhanging upper chord member (61), splicing and welding an overhanging straight web member (65) and an overhanging lower chord member (62) in sequence, splicing and welding an overhanging inclined web member (66), and simultaneously welding the overhanging upper chord member (61) and the overhanging lower chord member (62); finally, sequentially splicing and welding a lower chord connecting rod (63) and an upper chord connecting rod (64), sequentially splicing and assembling a cantilever conversion support (67) and a cantilever extension chord (68), simultaneously installing a through length sealing rod (13) at the end part and a through length conversion reinforcing rod (14) at the same time, and welding;

step seven, installing continuous parts at two ends of the light modeling secondary truss (2) and the main chord longitudinal connecting rods (12): the longitudinal connecting rod (12) of the main chord member is respectively welded with the light modeling secondary truss (2), the light modeling secondary truss (2) and the overhanging main truss (6); firstly, positioning an upper tire of an upper chord member (21) and welding and fixing the upper tire with a main chord member longitudinal connecting rod (12), then splicing and fixing an upper tire of a third straight web member (23), splicing an upper tire of a first combined lower chord member (22), respectively welding the upper chord member (21), the first combined lower chord member (22) and the third straight web member (23), and finally splicing and welding a third inclined web member (24);

step eight, installing a residual truss connecting rod (1): comprises an upper chord and a lower chord connecting horizontal rod are arranged between reinforced modeling secondary trusses (7), and an overhanging reinforced diagonal rod (15) is arranged between an overhanging main truss (6) and a positioning lattice column (3);

and step nine, overall quality inspection, namely finishing the large-span concave fish belly type combined reinforced truss structure.

Images